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package org.glassfish.config.support;

import org.glassfish.api.admin.AdminCommandContext;

import org.jvnet.hk2.annotations.Service;
import org.glassfish.hk2.api.PerLookup;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.TransactionFailure;

import java.beans.PropertyVetoException;

/**
 * An element decorator decorates a newly added configuration element, usually added
 * through the generic create command implementation.
 *
 * @author Jerome Dochez
 */
@PerLookup
public interface CreationDecorator<T extends ConfigBeanProxy> {

    /**
     * The element instance has been created and added to the parent, it can be
     * customized. This method is called within a {@link org.jvnet.hk2.config.Transaction}
     * and instance is therefore a writeable view on the configuration component.
     *
     * @param context administration command context
     * @param instance newly created configuration element
     * @throws TransactionFailure if the transaction should be rollbacked
     * @throws PropertyVetoException if one of the listener of <T> is throwing a veto exception
     */
    public void decorate(AdminCommandContext context, T instance) throws TransactionFailure, PropertyVetoException;

    /**
     * Default implementation of a decorator that does nothing.
     */
    @Service
    public class NoDecoration implements CreationDecorator<ConfigBeanProxy> {
        @Override
        public void decorate(AdminCommandContext context, ConfigBeanProxy instance) throws TransactionFailure, PropertyVetoException {
            // do nothing
        }
    }
}
